EPSG:9320

NZVD2016 height to Nelson 1955 height (2)

Attributes

Geodetic CRS: NZVD2016 height

Datum: New Zealand Vertical Datum 2016

Data source: EPSG

Information source: Land Information New Zealand (LINZ) standard S25009 and LINZ web site http://www.linz.govt.nz/

Revision date: 2020-03-14

Scope: Change of height to a different vertical reference surface.

Remarks: Derived at 256 control points. Mean offset 0.329m, standard deviation 0.039m, maximum difference from mean 0.114m. Supersedes NZVD2016 height to Nelson 1955 height (1) (code 7868) after change of grid file format.

Method: Vertical Offset by Grid Interpolation (gtx)

Area of use: New Zealand - South Island - north of approximately 42°20'S - Nelson vertical CRS area.

Description: (0,)

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Definition: OGC Well Known Text 2 (2019)

COORDINATEOPERATION["NZVD2016 height to Nelson 1955 height (2)",
    VERSION["LINZ-NZ NELS gtx"],
    SOURCECRS[
        VERTCRS["NZVD2016 height",
            VDATUM["New Zealand Vertical Datum 2016"],
            CS[vertical,1],
                AXIS["gravity-related height (H)",up,
                    LENGTHUNIT["metre",1]],
            ID["EPSG",7839]]],
    TARGETCRS[
        VERTCRS["Nelson 1955 height",
            VDATUM["Nelson 1955"],
            CS[vertical,1],
                AXIS["gravity-related height (H)",up,
                    LENGTHUNIT["metre",1]],
            ID["EPSG",5766]]],
    METHOD["Vertical Offset by Grid Interpolation (gtx)",
        ID["EPSG",1084]],
    PARAMETERFILE["Vertical offset file","nelsht1955-nzvd2016.gtx"],
    INTERPOLATIONCRS[
        GEOGCRS["NZGD2000",
            DATUM["New Zealand Geodetic Datum 2000",
                ELLIPSOID["GRS 1980",6378137,298.257222101,
                    LENGTHUNIT["metre",1]]],
            PRIMEM["Greenwich",0,
                ANGLEUNIT["degree",0.0174532925199433]],
            CS[ellipsoidal,2],
                AXIS["geodetic latitude (Lat)",north,
                    ORDER[1],
                    ANGLEUNIT["degree",0.0174532925199433]],
                AXIS["geodetic longitude (Lon)",east,
                    ORDER[2],
                    ANGLEUNIT["degree",0.0174532925199433]]]],
    OPERATIONACCURACY[0.02],
    USAGE[
        SCOPE["Change of height to a different vertical reference surface."],
        AREA["New Zealand - South Island - north of approximately 42°20'S - Nelson vertical CRS area."],
        BBOX[-42.44,171.82,-40.44,174.46]],
    ID["EPSG",9320],
    REMARK["Derived at 256 control points. Mean offset 0.329m, standard deviation 0.039m, maximum difference from mean 0.114m. Supersedes NZVD2016 height to Nelson 1955 height (1) (code 7868) after change of grid file format."]]

Definition: PROJ.4

+proj=vgridshift +grids=nz_linz_nelsht1955-nzvd2016.tif +multiplier=1

Definition: JavaScript (Proj4js)

proj4.defs("EPSG:9320","+proj=vgridshift +grids=nz_linz_nelsht1955-nzvd2016.tif +multiplier=1");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "Transformation",
    "name": "NZVD2016 height to Nelson 1955 height (2)",
    "source_crs": {
        "type": "VerticalCRS",
        "name": "NZVD2016 height",
        "datum": {
            "type": "VerticalReferenceFrame",
            "name": "New Zealand Vertical Datum 2016"
        },
        "coordinate_system": {
            "subtype": "vertical",
            "axis": [
                {
                    "name": "Gravity-related height",
                    "abbreviation": "H",
                    "direction": "up",
                    "unit": "metre"
                }
            ]
        },
        "id": {
            "authority": "EPSG",
            "code": 7839
        }
    },
    "target_crs": {
        "type": "VerticalCRS",
        "name": "Nelson 1955 height",
        "datum": {
            "type": "VerticalReferenceFrame",
            "name": "Nelson 1955"
        },
        "coordinate_system": {
            "subtype": "vertical",
            "axis": [
                {
                    "name": "Gravity-related height",
                    "abbreviation": "H",
                    "direction": "up",
                    "unit": "metre"
                }
            ]
        },
        "id": {
            "authority": "EPSG",
            "code": 5766
        }
    },
    "interpolation_crs": {
        "type": "GeographicCRS",
        "name": "NZGD2000",
        "datum": {
            "type": "GeodeticReferenceFrame",
            "name": "New Zealand Geodetic Datum 2000",
            "ellipsoid": {
                "name": "GRS 1980",
                "semi_major_axis": 6378137,
                "inverse_flattening": 298.257222101
            }
        },
        "coordinate_system": {
            "subtype": "ellipsoidal",
            "axis": [
                {
                    "name": "Geodetic latitude",
                    "abbreviation": "Lat",
                    "direction": "north",
                    "unit": "degree"
                },
                {
                    "name": "Geodetic longitude",
                    "abbreviation": "Lon",
                    "direction": "east",
                    "unit": "degree"
                }
            ]
        },
        "id": {
            "authority": "EPSG",
            "code": 4167
        }
    },
    "method": {
        "name": "Vertical Offset by Grid Interpolation (gtx)",
        "id": {
            "authority": "EPSG",
            "code": 1084
        }
    },
    "parameters": [
        {
            "name": "Vertical offset file",
            "value": "nelsht1955-nzvd2016.gtx",
            "id": {
                "authority": "EPSG",
                "code": 8732
            }
        }
    ],
    "accuracy": "0.02",
    "scope": "Change of height to a different vertical reference surface.",
    "area": "New Zealand - South Island - north of approximately 42°20'S - Nelson vertical CRS area.",
    "bbox": {
        "south_latitude": -42.44,
        "west_longitude": 171.82,
        "north_latitude": -40.44,
        "east_longitude": 174.46
    },
    "id": {
        "authority": "EPSG",
        "code": 9320
    },
    "remarks": "Derived at 256 control points. Mean offset 0.329m, standard deviation 0.039m, maximum difference from mean 0.114m. Supersedes NZVD2016 height to Nelson 1955 height (1) (code 7868) after change of grid file format."
}

Definition: MapServer - MAPfile

PROJECTION
	"proj=vgridshift"
	"grids=nz_linz_nelsht1955-nzvd2016.tif"
	"multiplier=1"
END

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=vgridshift +grids=nz_linz_nelsht1955-nzvd2016.tif +multiplier=1">
	<Layer srs="+proj=vgridshift +grids=nz_linz_nelsht1955-nzvd2016.tif +multiplier=1">
	</Layer>
</Map>

Definition: SQL (PostGIS)

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 9320, 'EPSG', 9320, '+proj=vgridshift +grids=nz_linz_nelsht1955-nzvd2016.tif +multiplier=1', 'None');